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d1e63c94 HH |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
6 | * Copyright (C) 1991, 1992 Linus Torvalds | |
7 | * Copyright (C) 1994 - 2000, 2006 Ralf Baechle | |
8 | * Copyright (C) 1999, 2000 Silicon Graphics, Inc. | |
9 | * Copyright (C) 2016, Imagination Technologies Ltd. | |
10 | */ | |
11 | #include <linux/compiler.h> | |
12 | #include <linux/errno.h> | |
13 | #include <linux/signal.h> | |
3f07c014 | 14 | #include <linux/sched/signal.h> |
d1e63c94 HH |
15 | #include <linux/uaccess.h> |
16 | ||
17 | #include <asm/abi.h> | |
18 | #include <asm/compat-signal.h> | |
19 | #include <asm/dsp.h> | |
20 | #include <asm/sim.h> | |
21 | #include <asm/unistd.h> | |
22 | ||
23 | #include "signal-common.h" | |
24 | ||
25 | /* | |
26 | * Including <asm/unistd.h> would give use the 64-bit syscall numbers ... | |
27 | */ | |
28 | #define __NR_O32_restart_syscall 4253 | |
29 | ||
30 | struct sigframe32 { | |
31 | u32 sf_ass[4]; /* argument save space for o32 */ | |
32 | u32 sf_pad[2]; /* Was: signal trampoline */ | |
33 | struct sigcontext32 sf_sc; | |
34 | compat_sigset_t sf_mask; | |
35 | }; | |
36 | ||
37 | struct ucontext32 { | |
38 | u32 uc_flags; | |
39 | s32 uc_link; | |
40 | compat_stack_t uc_stack; | |
41 | struct sigcontext32 uc_mcontext; | |
42 | compat_sigset_t uc_sigmask; /* mask last for extensibility */ | |
43 | }; | |
44 | ||
45 | struct rt_sigframe32 { | |
46 | u32 rs_ass[4]; /* argument save space for o32 */ | |
47 | u32 rs_pad[2]; /* Was: signal trampoline */ | |
48 | compat_siginfo_t rs_info; | |
49 | struct ucontext32 rs_uc; | |
50 | }; | |
51 | ||
52 | static int setup_sigcontext32(struct pt_regs *regs, | |
53 | struct sigcontext32 __user *sc) | |
54 | { | |
55 | int err = 0; | |
56 | int i; | |
57 | ||
58 | err |= __put_user(regs->cp0_epc, &sc->sc_pc); | |
59 | ||
60 | err |= __put_user(0, &sc->sc_regs[0]); | |
61 | for (i = 1; i < 32; i++) | |
62 | err |= __put_user(regs->regs[i], &sc->sc_regs[i]); | |
63 | ||
64 | err |= __put_user(regs->hi, &sc->sc_mdhi); | |
65 | err |= __put_user(regs->lo, &sc->sc_mdlo); | |
66 | if (cpu_has_dsp) { | |
67 | err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp); | |
68 | err |= __put_user(mfhi1(), &sc->sc_hi1); | |
69 | err |= __put_user(mflo1(), &sc->sc_lo1); | |
70 | err |= __put_user(mfhi2(), &sc->sc_hi2); | |
71 | err |= __put_user(mflo2(), &sc->sc_lo2); | |
72 | err |= __put_user(mfhi3(), &sc->sc_hi3); | |
73 | err |= __put_user(mflo3(), &sc->sc_lo3); | |
74 | } | |
75 | ||
76 | /* | |
77 | * Save FPU state to signal context. Signal handler | |
78 | * will "inherit" current FPU state. | |
79 | */ | |
80 | err |= protected_save_fp_context(sc); | |
81 | ||
82 | return err; | |
83 | } | |
84 | ||
85 | static int restore_sigcontext32(struct pt_regs *regs, | |
86 | struct sigcontext32 __user *sc) | |
87 | { | |
88 | int err = 0; | |
89 | s32 treg; | |
90 | int i; | |
91 | ||
92 | /* Always make any pending restarted system calls return -EINTR */ | |
93 | current->restart_block.fn = do_no_restart_syscall; | |
94 | ||
95 | err |= __get_user(regs->cp0_epc, &sc->sc_pc); | |
96 | err |= __get_user(regs->hi, &sc->sc_mdhi); | |
97 | err |= __get_user(regs->lo, &sc->sc_mdlo); | |
98 | if (cpu_has_dsp) { | |
99 | err |= __get_user(treg, &sc->sc_hi1); mthi1(treg); | |
100 | err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg); | |
101 | err |= __get_user(treg, &sc->sc_hi2); mthi2(treg); | |
102 | err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg); | |
103 | err |= __get_user(treg, &sc->sc_hi3); mthi3(treg); | |
104 | err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg); | |
105 | err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK); | |
106 | } | |
107 | ||
108 | for (i = 1; i < 32; i++) | |
109 | err |= __get_user(regs->regs[i], &sc->sc_regs[i]); | |
110 | ||
111 | return err ?: protected_restore_fp_context(sc); | |
112 | } | |
113 | ||
114 | static int setup_frame_32(void *sig_return, struct ksignal *ksig, | |
115 | struct pt_regs *regs, sigset_t *set) | |
116 | { | |
117 | struct sigframe32 __user *frame; | |
118 | int err = 0; | |
119 | ||
120 | frame = get_sigframe(ksig, regs, sizeof(*frame)); | |
121 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) | |
122 | return -EFAULT; | |
123 | ||
124 | err |= setup_sigcontext32(regs, &frame->sf_sc); | |
125 | err |= __copy_conv_sigset_to_user(&frame->sf_mask, set); | |
126 | ||
127 | if (err) | |
128 | return -EFAULT; | |
129 | ||
130 | /* | |
131 | * Arguments to signal handler: | |
132 | * | |
133 | * a0 = signal number | |
134 | * a1 = 0 (should be cause) | |
135 | * a2 = pointer to struct sigcontext | |
136 | * | |
137 | * $25 and c0_epc point to the signal handler, $29 points to the | |
138 | * struct sigframe. | |
139 | */ | |
140 | regs->regs[ 4] = ksig->sig; | |
141 | regs->regs[ 5] = 0; | |
142 | regs->regs[ 6] = (unsigned long) &frame->sf_sc; | |
143 | regs->regs[29] = (unsigned long) frame; | |
144 | regs->regs[31] = (unsigned long) sig_return; | |
145 | regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler; | |
146 | ||
147 | DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", | |
148 | current->comm, current->pid, | |
149 | frame, regs->cp0_epc, regs->regs[31]); | |
150 | ||
151 | return 0; | |
152 | } | |
153 | ||
96a68b14 | 154 | asmlinkage void sys32_rt_sigreturn(void) |
d1e63c94 HH |
155 | { |
156 | struct rt_sigframe32 __user *frame; | |
96a68b14 | 157 | struct pt_regs *regs; |
d1e63c94 HH |
158 | sigset_t set; |
159 | int sig; | |
160 | ||
96a68b14 PB |
161 | regs = current_pt_regs(); |
162 | frame = (struct rt_sigframe32 __user *)regs->regs[29]; | |
d1e63c94 HH |
163 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
164 | goto badframe; | |
165 | if (__copy_conv_sigset_from_user(&set, &frame->rs_uc.uc_sigmask)) | |
166 | goto badframe; | |
167 | ||
168 | set_current_blocked(&set); | |
169 | ||
96a68b14 | 170 | sig = restore_sigcontext32(regs, &frame->rs_uc.uc_mcontext); |
d1e63c94 HH |
171 | if (sig < 0) |
172 | goto badframe; | |
173 | else if (sig) | |
174 | force_sig(sig, current); | |
175 | ||
176 | if (compat_restore_altstack(&frame->rs_uc.uc_stack)) | |
177 | goto badframe; | |
178 | ||
179 | /* | |
180 | * Don't let your children do this ... | |
181 | */ | |
182 | __asm__ __volatile__( | |
183 | "move\t$29, %0\n\t" | |
184 | "j\tsyscall_exit" | |
96a68b14 PB |
185 | : /* no outputs */ |
186 | : "r" (regs)); | |
d1e63c94 HH |
187 | /* Unreached */ |
188 | ||
189 | badframe: | |
190 | force_sig(SIGSEGV, current); | |
191 | } | |
192 | ||
193 | static int setup_rt_frame_32(void *sig_return, struct ksignal *ksig, | |
194 | struct pt_regs *regs, sigset_t *set) | |
195 | { | |
196 | struct rt_sigframe32 __user *frame; | |
197 | int err = 0; | |
198 | ||
199 | frame = get_sigframe(ksig, regs, sizeof(*frame)); | |
200 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) | |
201 | return -EFAULT; | |
202 | ||
203 | /* Convert (siginfo_t -> compat_siginfo_t) and copy to user. */ | |
204 | err |= copy_siginfo_to_user32(&frame->rs_info, &ksig->info); | |
205 | ||
206 | /* Create the ucontext. */ | |
207 | err |= __put_user(0, &frame->rs_uc.uc_flags); | |
208 | err |= __put_user(0, &frame->rs_uc.uc_link); | |
209 | err |= __compat_save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]); | |
210 | err |= setup_sigcontext32(regs, &frame->rs_uc.uc_mcontext); | |
211 | err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set); | |
212 | ||
213 | if (err) | |
214 | return -EFAULT; | |
215 | ||
216 | /* | |
217 | * Arguments to signal handler: | |
218 | * | |
219 | * a0 = signal number | |
220 | * a1 = 0 (should be cause) | |
221 | * a2 = pointer to ucontext | |
222 | * | |
223 | * $25 and c0_epc point to the signal handler, $29 points to | |
224 | * the struct rt_sigframe32. | |
225 | */ | |
226 | regs->regs[ 4] = ksig->sig; | |
227 | regs->regs[ 5] = (unsigned long) &frame->rs_info; | |
228 | regs->regs[ 6] = (unsigned long) &frame->rs_uc; | |
229 | regs->regs[29] = (unsigned long) frame; | |
230 | regs->regs[31] = (unsigned long) sig_return; | |
231 | regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler; | |
232 | ||
233 | DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", | |
234 | current->comm, current->pid, | |
235 | frame, regs->cp0_epc, regs->regs[31]); | |
236 | ||
237 | return 0; | |
238 | } | |
239 | ||
240 | /* | |
241 | * o32 compatibility on 64-bit kernels, without DSP ASE | |
242 | */ | |
243 | struct mips_abi mips_abi_32 = { | |
244 | .setup_frame = setup_frame_32, | |
245 | .setup_rt_frame = setup_rt_frame_32, | |
246 | .restart = __NR_O32_restart_syscall, | |
247 | ||
248 | .off_sc_fpregs = offsetof(struct sigcontext32, sc_fpregs), | |
249 | .off_sc_fpc_csr = offsetof(struct sigcontext32, sc_fpc_csr), | |
250 | .off_sc_used_math = offsetof(struct sigcontext32, sc_used_math), | |
251 | ||
252 | .vdso = &vdso_image_o32, | |
253 | }; | |
254 | ||
255 | ||
96a68b14 | 256 | asmlinkage void sys32_sigreturn(void) |
d1e63c94 HH |
257 | { |
258 | struct sigframe32 __user *frame; | |
96a68b14 | 259 | struct pt_regs *regs; |
d1e63c94 HH |
260 | sigset_t blocked; |
261 | int sig; | |
262 | ||
96a68b14 PB |
263 | regs = current_pt_regs(); |
264 | frame = (struct sigframe32 __user *)regs->regs[29]; | |
d1e63c94 HH |
265 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
266 | goto badframe; | |
267 | if (__copy_conv_sigset_from_user(&blocked, &frame->sf_mask)) | |
268 | goto badframe; | |
269 | ||
270 | set_current_blocked(&blocked); | |
271 | ||
96a68b14 | 272 | sig = restore_sigcontext32(regs, &frame->sf_sc); |
d1e63c94 HH |
273 | if (sig < 0) |
274 | goto badframe; | |
275 | else if (sig) | |
276 | force_sig(sig, current); | |
277 | ||
278 | /* | |
279 | * Don't let your children do this ... | |
280 | */ | |
281 | __asm__ __volatile__( | |
282 | "move\t$29, %0\n\t" | |
283 | "j\tsyscall_exit" | |
96a68b14 PB |
284 | : /* no outputs */ |
285 | : "r" (regs)); | |
d1e63c94 HH |
286 | /* Unreached */ |
287 | ||
288 | badframe: | |
289 | force_sig(SIGSEGV, current); | |
290 | } |